The MAX5821 is a dual, 10-bit voltage-output, digital-toanalog converter (DAC) with an I 2 C*-compatible, 2-wire interface that operates at clock rates up to 400kHz. The device operates from a single 2.7V to 5.5V supply 115A at VDD = 3.6V. A power-down mode decreases current consumption to less than 1A. The MAX5821 features three software-selectable power-down output impedances: 100k, 1k, and high impedance. Other features include internal precision rail-to-rail output buffers and a power-on reset (POR) circuit that powers up the DAC in the 100k power-down mode. The MAX5821 features a double-buffered I2C-compatible serial interface that allows multiple devices to share a single bus. All logic inputs are CMOS-logic compatible and buffered with Schmitt triggers, allowing direct interfacing to optocoupled and transformer-isolated interfaces. The MAX5821 minimizes digital noise feedthrough by disconnecting the clock (SCL) signal from the rest of the device when an address mismatch is detected. The MAX5821 is specified over the extended temperature range of -40C to +85C and is available in a miniature 8pin MAX package. Refer to the MAX5822 data sheet for the 12-bit version and the MAX5820 data sheet for the 8-bit version.